Iv got a bit of a weird problem at the moment where if it rains, my car all of a sudden thinks a door has been left open. Thus leaving me to drive around with the interior lights on and the central locking wont lock the doors. Once the car dries out a bit its ok again.

So obviously water is getting in somewhere and causing a problem. Anyone got any ideas on where I should be looking to fix this?

Try the buttons in the door jamb that register when your door is open, you may be getting water in them and causing them to short out. Just pull them out and give them a clean up and fit them back making sure it's sealed correct.

Try the buttons in the door jamb that register when your door is open, you may be getting water in them and causing them to short out.  Just pull them out and give them a clean up and fit them back making sure it's sealed correct.

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goto dick smiths and get some dielectric grease. Use that on the switch contacts and to seal the boot around the switch...